Validating an email address
Simple and safe workaround for this is using strlen() before filter_val().I'm not sure about 5.3.4 final, but it is written that some 5.3.4-snapshot versions also were affected. If you have indeed done that and your solution contains a long, hard-to-read regular expression (like most of them seen on Stack Overflow) do, I have bad news for you: Your code is wrong.Did you know that parentheses, spaces and - according to the RFC 6531 document - emojis can be a part of a valid e-mail address - and that is it merely an character? The RFCs are much more flexible than any regular expression can be, including special cases like certain characters which are only allowed when they are insite a quoted string, but the quoted string must not stand between two periods. Of course you can still catch a majority of all invalid e-mail addresses with a sufficiently complex regular expression, but I seriously recommend you to aim for more than just "almost bug-free" code.Not only will we use regexes to do the validation but we’ll cover some other strategies.
One way to detect this is using some common patterns.
For example, an email address will often have noreply somewhere in it.
If you are a developer of "web applications", you probably have written (or copy-pasted) some code which tries to validate an entered e-mail address.
A valid email is of the format: [email protected] The name can be a set of ‘atoms’ separated by dots. single or double quotes and any character inside the quotes Now, to the domain part. MUSEUM .travel, .international or even .vermögensberatung For example all the following email addresses are valid: Source The sad truth is that despite the complex regular expression validation, the email may not be existing, so can still be invalid for practical purposes.
Most email validation checks assumes that the top level domain can have up to 4 characters. You have just validated the format – not its existence.